Chitin: A resistant organic compound with the same basic carbohydrate structure as cellulose, but nitrogenous because some hydroxyl groups are replaced by ascetamide groups. It is a common constituent of various invertebrate skeletons such as insect exoskeletons and foraminiferal inner test, and also occurs in hyphae and spores of fungi.Found on http://www.encyclo.co.uk/local/22047

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